342 MEXICAN BOUND AUY SHELLS— BALL. vol.xix. 



mature specimeus by a smooth callus over the body; the outer lip is 

 tiexuous, receding' near the peripliery and more vertical at the base; the 

 aperture is entirely destitute of teeth. Height 7.7, major diameter 18, 

 minor diameter 14.8 mm. 



Near Tiu5Son, Arizona, Cox; Fly Park, Chiricahua Mountains, Ari- 

 zona, at an elevation of 1(),(H)() feet, Dr. Fisher, Ignited States Depart- 

 ment of Agriculture. No. 124481, U.S.N.M. riemez Mountains, near 

 I>land,New ^Mexico, and at Jemez Sulphur Springs, 8-10,000 feet above 

 the sea, Ashmun. 



This form has been mistaken for a variety of P. lercttei without 

 teeth, but is clearly another species. An examination of over seventy- 

 five specimens shows that none of them has a trace of lip teeth, and 

 there are no si)ecimens otherwise intermediate. As compared with /'. 

 lerettei the shell is uniformly larger and yet with 1 whorl less, but pro- 

 portionally more depressed. The actual measurements of the largest 

 sjjecimen of levettei I could find are: Height 7.7, major diameter 15.7, 

 minor diameter 13 ram. The surface, color, etc., are very similar in 

 both species. Numerous specimens show a resting stage at about 

 the last half of the last whorl, where the shell has been thickened 

 and shows a slight constriction, followed by an opaque space, which, 

 however, seems never to have had a reflected lip. 



A A'ariety shows a small feeble parietal denticle, like that of P. 

 pseudo(hnta, bnt the lip is uot denticulate. 



With this species Dr. Fisher collected Vitrea nrhorea, Say, Thysano- 

 phora ingersoUii, Bland, and Pyramidula stnateUa, Anthony. The 

 locality is in Cochise County near the southeastern angle of Arizona, 

 close to the Mexican boundary line. 



Mr. Binney has compared this species to P. muUani, Bland, and P. 

 Moicaensis, Simpson, but both these species are of the Me-sodon tj^pe, 

 and apparently not closely related either to P. lerettei or P. chiricahnana. 

 Neither MuHani nor Kioicaensi.s are known from the region in which 

 alone, so far, the other two have been collected. 



I have included this species here, as it belongs to the same faunal 

 region, and is therefore naturally associated with the species collected 

 by Dr. Mearns. 



POLYGYRA ASHMUNI, Dall. 



The Rev. E. H. Ashmun, of Albuquerque, New Mexico, has forwarded 

 for examination some shells which api)ear to be fnlly adult and normal, 

 and resend)le extremely, in miniature, Pohjijyra ehiricahuana. They 

 differ from it in size, being only 14 mm. in greatest diameter and 7 mm. 

 in height, and in the surface, which, when strongly magnified, is seen to 

 be covered with sharp, delicate, spiral, incised lines, with wider inter- 

 spaces. The number of whorls is but slightly less, if at all different 

 from P. chirieahiKuia, and, if the element of actual size be ignored, the 

 figure here given of the latter will equally well represent the present 



